Good advice. If you are getting into mining just looking to make a profit its a very difficult time. That being said that is what everyone said last June, I didn't do it then and kicked myself for it.
Yes, people have been saying it for awhile now, and while the timing may have been off the advice is still sound. The problem is that last June we were still in a strong bull market with a lot of upward price potential to look forward to and the mining difficulty was quite a bit lower than it is right now.
Now 9 months later the mining difficulty is still at stratospheric levels and continuing to climb, hardware prices are easily 2 to 3x what they were last June, but coin prices have plummeted 50% from their highs with no real signs of reversing. Indeed, coin prices may very well continue to drop some more.
I fully expect we will drop below $1 per day a GPU in profit very soon, and may even drop down into the 50 cent/day range. Trying to pay off a $600 video card that should only cost $200 with a 50 cent/day profit is going to change a lot of opinions on the feasibility of mining in short order. Even with free electricity, taking 1200 days or 3-1/4 years to payback your GPU investment is not too attractive of a prospect, assuming the GPU even lasts that long while 24/7 mining.